import random
n = int(input())
p = 0 #попадания
if n <= 0:
    print("error")
else:
    for i in range(n):
        x = random.randint(-100,100)
        y = random.randint(-100,100)
        if x >= -7 and x<= 5 and y >= -8 and y <= 5:
            p += 1
print(p)

